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The iPad is a line of tablet computers designed, developed and marketed by Apple and it is primarily as a platform for audio-visual media including books, periodicals, movies, music, games, and web content, etc.

Introduction of iPad

iPad is a line of tablet computers designed and marketed by Apple Inc., which runs Apple's iOS. The first iPad was released on April 3, 2010; the most recent iPad models, the iPad Air and second generation iPad Mini, were revealed on October 22, 2013 and went on sale November 1, 2013, and November 12, 2013, respectively. The user interface is built around the device's multi-touch screen, including a virtual keyboard. The iPad has built-in Wi-Fi and, on some models, cellular connectivity. As of June, 2014, there have been over 200 million iPads sold since its release in 2010.

There have been five versions of the iPad. The first generation established design precedents, such as the 9.7-inch screen size and button placement, that have persisted through all models. The iPad 2 added a dual core Apple A5 processor and VGA front-facing and 720p rear-facing cameras designed for FaceTime video calling. The third generation added a Retina Display, the new Apple A5X processor with a quad-core graphics processor, a 5-megapixel camera, HD 1080p video recording, voice dictation, and 4G (LTE). The fourth generation added the Apple A6X processor and replaces the 30-pin connector with an all-digital Lightning connector. The iPad Air added the Apple A7 processor, the Apple M7 motion coprocessor and reduced the form factor for the first time since the iPad 2. iOS 6.0 added Siri to the third and fourth generations and the iPad Mini.

Model Comparison

Model iPad iPad 2 iPad 3 iPad 4 iPad Air
Model Number A1219 (WiFi) A1337 (WiFi + 3G) A1395 (WiFi) A1397 (WiFi + 3G CDMA) A1396 (WiFi + 3G GSM) A1416 (WiFi) A1403 (WiFi + Cellular VZ) A1430 (WiFi + Cellular) A1458 (WiFi) A1459 (WiFi + Cellular) A1460 (WiFi + Cellular MM) A1474 (WiFi) A1475 (WiFi + Cellular)
Status Discontinued Discontinued Discontinued Available Available
SoC Apple A4 Apple A5 Apple A5X Apple A6X Apple A7
Motion coprocessor N/A N/A N/A N/A Apple M7
CPU 1 GHz ARM Cortex-A8 1 GHz dual-core ARM Cortex-A9 1.4 GHz dual-core Apple Swift 1.4 GHz dual-core Apple Cyclone
GPU PowerVR SGX535 Dual-core PowerVR SGX543MP2 Quad-core PowerVR SGX543MP4 Quad-core PowerVR SGX554MP4 Quad-core PowerVR G6430
Memory 256 MB DDR RAM built into Apple A4 package 512 MB DDR2 RAM (1066 Mbit/s data rate) built into Apple A5 package 1024 MB LPDDR2 RAM 1024 MB LPDDR3 RAM
Storage 16, 32, or 64 GB 16, 32, 64, or 128 GB
Display 9.7 inches (250 mm) multi-touch display with LED backlighting and a fingerprint and scratch-resistant coating
1024×768 pixels at 132 ppi 2048×1536 pixels at 264 ppi (Retina Display)
Camera Back N/A 720 p HD still and video camera 0.7 MP, 30fps and 5× digital zoom 1080p HD still and video camera
5 MP, 30fps and 5× digital zoom
Rear N/A VGA-quality still and videocamera, 0.3 MP 1.2 MP still, 720p video
Wireless Wi-Fi Wi-Fi (802.11a/b/g/n), Bluetooth 2.1+EDR Wi-Fi (802.11a/b/g/n), Bluetooth 4.0
Wi-Fi + 3G/Cellular In addition to above:
3G cellular HSDPA, 2G cellular EDGE on 3G models
In addition to above and left:
3G transitional LTE on Cellular model
Geolocation Wi-Fi Wi-Fi, Apple location databases
Wi-Fi + 3G/Cellular Assisted GPS, Apple databases, Cellular network Additionally: GLONASS
Environmental sensors Accelerometer, ambient light sensor, magnetometer Additionally: gyroscope
Battery Built-in lithium-ion polymer battery.
browsing: 10 hours (Wi-Fi), 9 hours (3G/Cellular); video: 10 hours; audio: 140 hours; standby: 1 month[
Operating system Up to iOS 5.1.1 iOS 7
Dimensions 9.56 × 7.47 × 0.528 in (242.8 × 189.7 × 13.4 mm) 9.5 × 7.31 × 0.346 in (241 × 186 × 9 mm) 9.5 × 7.31 × 0.37 in (241 × 186 × 9 mm) 9.4 × 6.6 × 0.295 in (238.8 × 167.6 × 7.5 mm)
Mechanical keys Home, sleep, volume rocker, variable function switch (originally screen rotation lock, mute in iOS 4.2, either in 4.3 and later)
Connector 30-pin Lightning
Greenhouse gas emissions 130 kg CO2e 105 kg CO2e 180 kg CO2e 170 kg CO2e 180 kg CO2e

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